<!doctype html>
<meta charset=utf-8>
<title>RTCRtpParameters encodings</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/webrtc/dictionary-helper.js"></script>
<script src="/webrtc/RTCRtpParameters-helper.js"></script>
<script>
  'use strict';

  // Test is based on the following editor draft:
  // https://w3c.github.io/webrtc-svc/

  // Get the first encoding in param.encodings.
  // Asserts that param.encodings has at least one element.
  function getFirstEncoding(param) {
    const { encodings } = param;
    assert_equals(encodings.length, 1);
    return encodings[0];
  }

  promise_test(async t => {
    const pc = new RTCPeerConnection();
    t.add_cleanup(() => pc.close());
    const { sender } = pc.addTransceiver('video', {
      sendEncodings: [{scalabilityMode: 'L1T3'}],
    });

    const param = sender.getParameters();
    const encoding = getFirstEncoding(param);

    assert_equals(encoding.scalabilityMode, 'L1T3');

  }, `Setting scalabilityMode to a legal value should be accepted`);

  promise_test(async t => {
    const capabilities = RTCRtpSender.getCapabilities('video');
    var svcSupported = false;
    for (const codec of capabilities.codecs) {
      if ('scalabilityModes' in codec && codec.scalabilityModes.length > 0) {
        svcSupported = true;
      }
    }
    assert_true(svcSupported);
  }, `Sender capabilities should include at least some scalability modes`);

</script>
